Blackfoot River Fishing Report, July 17, 2026

2026-07-17 (July 17, 2026)

Regional summary

Not much has moved on the calendar in the three days since the last report, and yet the season keeps inching forward. Every valley gauge is a notch lower than it was, the water keeps clearing, and the bug board has finished its handoff: the big stoneflies that carried June are essentially done, and trout have settled into a steady summer diet of PMDs, Yellow Sallies, caddis, Green Drakes on the gray days, and the first real wave of terrestrials. The one variable running the whole show is heat. Mornings still start cool and friendly, but midday water is now creeping into the upper 60s and low 70s on the valley rivers, so the productive clock has slid hard toward early and late. The other new wrinkle is a regulation change worth knowing before you load the boat: the Blackfoot closed to floating from Weigh Station down to the I-90 bridge on July 15, running through October 31. Carry a thermometer, start at first light, get fish in and released quickly in the warm afternoons, and check Montana FWP for restrictions before every trip, since nothing was posted when the shops filed but a hot week can flip that overnight.

At a glance: Low, clear, and dropping from Ovando through the canyon | slightly off color to clear | ~64°F morning, ~69°F midday | ~1,280 CFS near Bonner (live USGS, down from ~1,440 last report) | GH rating: 3/5 | Best window: early and late

Float hazard: floater hazards below Harry Morgan. An obstruction on the North Fork below Harry Morgan campground has caused several boat accidents. Walk your boat around it or put in at River Junction instead. A separate strainer tree roughly a mile below Harry Morgan (near 46.98791, -113.11272) has also hung up boats. Keep your hands on the oars, eyes downstream, and call Blackfoot River Outfitters (406.542.7411) before floating that water.

The Blackfoot has shed still more water and now runs low and clear from Ovando down through the canyon to the Clark Fork confluence. That clarity cuts both ways: fish can inspect everything, so a clean, drag-free drift matters more than it did a month ago. The heavy stonefly focus is gone, and trout have tucked into the soft summer lies, willow lines, buckets, riffle edges, tailouts, and the slower shelves below the faster water. The fishing is still there and consistent, but the window has narrowed with the heat, so the cool morning and cooling evening hours are what count now. One access note beyond the float closure: Weigh Station is your last takeout above the closed stretch, so plan floats accordingly.

Best techniques

• Cover water with a dry-dropper. Float a #8-12 Chubby Chernobyl (purple, tan, or peach), a Water Walker, or a lingering Golden Stone up top and hang a #14-16 PMD nymph, Frenchie, Duracell, Pheasant Tail, Caddis Pupa, or Perdigon two to three feet below. Start deep and shorten as fish move up in the column.
• The mornings are quietly the sleeper play: watch soft slicks, foam lines, and tailouts for PMD spinner sippers before you wade through them, since those rises are subtle and easy to blow past. Evening belongs to caddis. When the sun drops and fish slide onto the shallow banks and riffle edges, a #14-16 Elk Hair Caddis, Corn Fed Caddis, or X-Caddis earns eats. Mix in a Purple Haze or Parachute Adams for the mayfly crowd, and start carrying ants and beetles.
• If the surface goes quiet in the bright middle of the day, swing a small flashy streamer through the plunge pools, boulder pockets, and riffle drops: a Swim Coach, Sparkle Minnow, Mini Dungeon, or Thin Mint. The counter crew at Kingfisher had today's read dialed to the gauge, so it is worth a two-minute stop on the way east to hear which reach cleaned up overnight.

Hatches

Golden Stones mostly finished but still worth a searching dry, steady PMDs with morning spinner falls, Green Drakes whenever the light goes gray, Yellow Sallies through midday, nocturnal stones early along the banks, and caddis thickening into the evening. Spruce moths and hoppers are just starting to show.

The Fly Box

Nymphs: Pat's Rubber Legs, TJ Hooker, Double Bead Stones, Zirdles, Frenchies, Split Case PMDs, Green Drake Nymphs, Caddis Pupa, Duracell, Perdigons, Pheasant Tails

Dries: Chubby Chernobyls, Water Walkers, Golden Stones, PMD Spinners, Green Drakes, Yellow Sallies, Elk Hair Caddis, X-Caddis, Corn Fed Caddis, Purple Haze, Parachute Adams, Ants and Beetles

Streamers: Swim Coach, Sparkle Minnows, Mini Dungeons, Peanut Envy, Sculpzilla, Thin Mints, Woolly Buggers, JJ Special

Outlook. Hot with a heavy thunderstorm chance today, then a warm, sunny weekend with highs in the 80s and 90s and more 80s into next week. Fish early, watch afternoon water temperatures as the heat builds, and if a hard cell parks up high, keep an eye on color sliding down Monture.

Sources and Thanks

Shop	Report date	Coverage
Kingfisher Fly Shop	July 17, 2026	All four rivers (freshest)
The Missoulian Angler	July 16, 2026	All four rivers
Blackfoot River Outfitters	July 10, 2026	All four rivers
Grizzly Hackle	July 10, 2026	All four rivers
Lightweight Fly Shop	July 5, 2026	All four rivers, consolidated weekly